Slidable resin composition and molded article thereof

Abstract

A resin composition comprising 3.0 to 7.0 parts by weight of an acryl-modified polyorganosiloxane (component B) obtained by graft copolymerizing a specific polyorganosiloxane (component B1) with a (meth)acrylic ester based on 100 parts by weight of an aromatic polycarbonate resin (component A), and a molded article thereof. The resin composition is excellent in slidability, impact resistance, heat resistance and dimensional stability and has a good surface appearance.

The invention claimed is: 
     
       1. A resin composition consisting of 3.2 to 6.8 parts by weight of an acryl-modified polyorganosiloxane (component B) based on 100 parts by weight of an aromatic polycarbonate resin (component A),
 wherein the acryl-modified polyorganosiloxane (component B) is obtained by graft copolymerizing a polyorganosiloxane (component B1) represented by the following formula (1) with a mixture (component B2) of 70 to 100 wt % of a (meth)acrylic ester (component B2-1) and 0 to 30 wt % of another copolymerizable monomer (component B2-2) in a (component B2/component B1) weight ratio of 5/95 to 95/5: 
 
       
         
           
           
               
               
           
         
         and 
       
       wherein in the above formula, R 1 , R 2  and R 3  are each independently a hydrocarbon group having 1 to 20 carbon atoms or a halogenated hydrocarbon group having 1 to 20 carbon atoms, Y is a radical reactive group selected from the group consisting of a vinyl group, an allyl group and a γ-(meth)acryloxypropyl group, X 1  and X 2  are each independently a hydrogen atom, an alkyl group having 1 to 4 carbon atoms or a group represented by —SiR 4 R 5 R 6  (R 4  and R 5  are each independently a hydrocarbon group having 1 to 20 carbon atoms or a halogenated hydrocarbon group having 1 to 20 carbon atoms, and R 6  is a hydrocarbon group having 1 to 20 carbon atoms, a halogenated hydrocarbon group having 1 to 20 carbon atoms or a radical reactive group selected from the group consisting of a vinyl group, an allyl group and a γ-(meth)acryloxypropyl group), m is a positive integer of 10,000 or less, and n is an integer of 1 to 500. 
     
     
       2. The resin composition according to  claim 1 , wherein the component B2-1 is methyl methacrylate and/or 2-hydroxyethyl methacrylate. 
     
     
       3. The resin composition according to  claim 1 , wherein the weight ratio of the component B2 to the component B1 is 20/80 to 60/40. 
     
     
       4. A resin composition consisting of 3.2 to 6.8 parts by weight of an acryl-modified polyorganosiloxane (component B) based on 100 parts by weight of an aromatic polycarbonate resin (component A) and 0.005 to 0.6 part by weight of an organic metal salt-based flame retardant (component C) based on 100 parts by weight of the aromatic polycarbonate resin (component A),
 wherein the acryl-modified polyorganosiloxane (component B) is obtained by graft copolymerizing a polyorganosiloxane (component B1) represented by the following formula (1) with a mixture (component B2) of 70 to 100 wt % of a (meth)acrylic ester (component B2-1) and 0 to 30 wt % of another copolymerizable monomer (component B2-2) in a (component B2/component B1) weight ratio of 5/95 to 95/5: 
 
       
         
           
           
               
               
           
         
         and 
       
       wherein in the above formula, R 1 , R 2  and R 3  are each independently a hydrocarbon group having 1 to 20 carbon atoms or a halogenated hydrocarbon group having 1 to 20 carbon atoms, Y is a radical reactive group selected from the group consisting of a vinyl group, an allyl group and a γ-(meth)acryloxypropyl group. X 1  and X 2  are each independently a hydrogen atom, an alkyl group having 1 to 4 carbon atoms or a group represented by —SiR 4 R 5 R 6  (R 4  and R 5  are each independently a hydrocarbon group having 1 to 20 carbon atoms or a halogenated hydrocarbon group having 1 to 20 carbon atoms, and R 6  is a hydrocarbon group having 1 to 20 carbon atoms, a halogenated hydrocarbon group having 1 to 20 carbon atoms or a radical reactive group selected from the group consisting of a vinyl group, an allyl group and a γ-(meth)acryloxypropyl group), m is a positive integer of 10,000 or less, and n is an integer of 1 to 500. 
     
     
       5. The resin composition according to  claim 4 , wherein the organic metal salt-based flame retardant (component C) is an alkali (earth) metal salt of an organic acid. 
     
     
       6. The resin composition according to  claim 5 , wherein the alkali (earth) metal salt of an organic acid (component C) is an alkali (earth) metal salt of an organic sulfonic acid. 
     
     
       7. A resin composition consisting of 3.2 to 6.8 parts by weight of an acryl-modified polyorganosiloxane (component B) based on 100 parts by weight of an aromatic polycarbonate resin (component A) and 4.0 to 9.0 parts by weight of an organic phosphorus compound-based flame retardant (component D) based on 100 parts by weight of the aromatic polycarbonate resin (component A),
 wherein the acryl-modified polyorganosiloxane (component B) is obtained by graft copolymerizing a polyorganosiloxane (component B1) represented by the following formula (1) with a mixture (component B2) of 70 to 100 wt % of a (meth)acrylic ester (component B2-1) and 0 to 30 wt % of another copolymerizable monomer (component B2-2) in a (component B2/component B1) weight ratio of 5/95 to 95/5: 
 
       
         
           
           
               
               
           
         
         and 
       
       wherein in the above formula, R 1 , R 2  and R 3  are each independently a hydrocarbon group having 1 to 20 carbon atoms or a halogenated hydrocarbon group having 1 to 20 carbon atoms, Y is a radical reactive group selected from the group consisting of a vinyl group, an allyl group and a γ-(meth)acryloxypropyl group, X 1  and X 2  are each independently a hydrogen atom, an alkyl group having 1 to 4 carbon atoms or a group represented by —SiR 4 R 5 R 6  (R 4  and R 5  are each independently a hydrocarbon group having 1 to 20 carbon atoms or a halogenated hydrocarbon group having 1 to 20 carbon atoms, and R 6  is a hydrocarbon group having 1 to 20 carbon atoms, a halogenated hydrocarbon group having 1 to 20 carbon atoms or a radical reactive group selected from the group consisting of a vinyl group, an allyl group and a γ-(meth)acryloxypropyl group), m is a positive integer of 10,000 or less, and n is an integer of 1 to 500. 
     
     
       8. A resin composition consisting of 3.2 to 6.8 parts by weight of an acryl-modified polyorganosiloxane (component B) based on 100 parts by weight of an aromatic polycarbonate resin (component A) and 0.01 to 1 part by weight of a fluorine-containing dripping inhibitor (component E) based on 100 parts by weight of the aromatic polycarbonate resin (component A),
 wherein the acryl-modified polyorganosiloxane (component B) is obtained by graft copolymerizing a polyorganosiloxane (component B1) represented by the following formula (1) with a mixture (component B2) of 70 to 100 wt % of a (meth)acrylic ester (component B2-1) and 0 to 30 wt % of another copolymerizable monomer (component B2-2) in a (component B2/component B1) weight ratio of 5/95 to 95/5: 
 
       
         
           
           
               
               
           
         
         and 
       
       wherein in the above formula, R 1 , R 2  and R 3  are each independently a hydrocarbon group having 1 to 20 carbon atoms or a halogenated hydrocarbon group having 1 to 20 carbon atoms, Y is a radical reactive group selected from the group consisting of a vinyl group, an allyl group and a γ-(meth)acryloxypropyl group, X 1  and X 2  are each independently a hydrogen atom, an alkyl group having 1 to 4 carbon atoms or a group represented by —SiR 4 R 5 R 6  (R 4  and R 5  are each independently a hydrocarbon group having 1 to 20 carbon atoms or a halogenated hydrocarbon group having 1 to 20 carbon atoms, and R 6  is a hydrocarbon group having 1 to 20 carbon atoms, a halogenated hydrocarbon group having 1 to 20 carbon atoms or a radical reactive group selected from the group consisting of a vinyl group, an allyl group and a γ-(meth)acryloxypropyl group), m is a positive integer of 10,000 or less, and n is an integer of 1 to 500. 
     
     
       9. A resin composition consisting of 3.2 to 6.8 parts by weight of an acryl-modified polyorganosiloxane (component B) based on 100 parts by weight of an aromatic polycarbonate resin (component A) and 4.0 to 9.0 parts by weight of an organic phosphorus compound-based flame retardant (component D) and 0.01 to 1 part by weight of a fluorine-containing dripping inhibitor (component E) based on 100 parts by weight of the aromatic polycarbonate resin (component A),
 wherein the acryl-modified polyorganosiloxane (component B) is obtained by graft copolymerizing a polyorganosiloxane (component B1) represented by the following formula (1) with a mixture (component B2) of 70 to 100 wt % of a (meth)acrylic ester (component B2-1) and 0 to 30 wt % of another copolymerizable monomer (component B2-2) in a (component B2/component B1) weight ratio of 5/95 to 95/5: 
 
       
         
           
           
               
               
           
         
         and 
       
       wherein in the above formula, R 1 , R 2  and R 3  are each independently a hydrocarbon group having 1 to 20 carbon atoms or a halogenated hydrocarbon group having 1 to 20 carbon atoms, Y is a radical reactive group selected from the group consisting of a vinyl group, an allyl group and a γ-(meth)acryloxypropyl group, X 1  and X 2  are each independently a hydrogen atom, an alkyl group having 1 to 4 carbon atoms or a group represented by —SiR 4 R 5 R 6  (R 4  and R 5  are each independently a hydrocarbon group having 1 to 20 carbon atoms or a halogenated hydrocarbon group having 1 to 20 carbon atoms, and R 6  is a hydrocarbon group having 1 to 20 carbon atoms, a halogenated hydrocarbon group having 1 to 20 carbon atoms or a radical reactive group selected from the group consisting of a vinyl group, an allyl group and a γ-(meth)acryloxypropyl group), m is a positive integer of 10,000 or less, and n is an integer of 1 to 500. 
     
     
       10. The resin composition according to  claim 7 , wherein the organic phosphorus compound-based flame retardant (component D) is a phosphate represented by the following formula (2): 
       
         
           
           
               
               
           
         
         wherein in the above formula, X is a diphenol residue derived from a dihydroxy compound selected from the group consisting of hydroquinone, resorcinol, bis(4-hydroxydiphenyl)methane, bisphenol A, dihydroxydiphenyl, dihydroxynaphthalene, bis(4-hydroxyphenyl)sulfone, bis(4-hydroxyphenyl)ketone and bis(4-hydroxyphenyl)sulfide, j, k, l and m are each independently 0 or 1, and n is an integer of 0 to 5 (n is an average value in the case of a mixture of phosphates having different degrees n of polymerization), and R 11 , R 12 , R 13  and R 14  are each independently a monophenol residue derived from an aryl group selected from the group consisting of phenol, cresol, xylenol, isopropylphenol, butylphenol and p-cumylphenol which may be substituted by a halogen atom. 
       
     
     
       11. A molded article comprising the resin composition of  claim 1 .